LID.L Regulatory News (LID)

Press Release

15 April 2011

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached: ii

Lidco Group PLC

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

YES

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

 NO

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

 NO

An event changing the breakdown of voting rights

NO

Other (please specify):

 NO

3. Full name of person(s) subject to thenotification obligation: iii

Ingalls & Snyder LLC ("I&S") and Ingalls & Snyder Value Partners LP ("ISVP").

4. Full name of shareholder(s)  (if different from 3.):iv

I&S, on behalf of its clients, has dispositive authority over (i.e. the power and authorization to sell at I&S's discretion) 24,424,368 shares. In respect of 13,820,000 of such 24,424,368 shares ISVP (as beneficial owner) shares dispositive authority with I&S and has voting authority. So in respect of the 13,820,000 shares beneficially held by ISVP, I&S has and ISVP share dispositive authority and ISVP has voting authority.

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

April 13, 2011

6. Date on which issuer notified:

April 14, 2011

7. Threshold(s) that is/are crossed orreached: vi, vii

Interest in excess of 14% of issued share capital.

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

Ordinary Shares of 0.5 pence ISIN GB0030546849

23,855,746

-

24,424,368

See note 4 above. I&S has dispositive authority over 24,424,368 shares and ISVP has voting authority and shares dispositive authority in respect of 13,820,000 of such shares.

-

14.04% (Note: For these purposes we have assumed that dispositive authority is equivalent to voting rights).

-

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

N/A

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date xvii

Exercise/Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

N/A

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

24,424,368 (Note: For these purposes we have assumed that dispositive authority is equivalent to voting rights).

14.04% (Note: For these purposes we have assumed that dispositive authority is equivalent to voting rights).

9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable: xxi

N/A

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will ceaseto hold:

N/A

12. Date on which proxy holder will cease to holdvoting rights:

N/A

13. Additional information:

14. Contact name:

Frank Stolba

15. Contact telephone number:

(001) (212) 269 - 7814

LiDCO Group Plc

Terry O'Brien (CEO)

Tel: +44 (0)20 7749 1500

Paul Clifford (Finance Director)

Theresa Wallis (Chairman)

www.lidco.com

FinnCap

Geoff Nash / Henrik Persson

Stephen Norcross (broking)

Tel: +44 (0)20 7600 1658

www.finncap.com

Abchurch

Adam Michael / Joanne Shears /

Simone Elviss / Claire Dickinson

Tel: +44 (0) 20 7398 7728

simone.elviss@abchurch-group.com

www.abchurch-group.com

LiDCOplus: a computer-based platform monitor used in the Intensive Care Unit for real-time continuous display of hemodynamic parameters including cardiac output, oxygen delivery and fluid-volume responsiveness (PPV% and SVV%)

LiDCOrapid: a cardiac output monitor designed specifically for use in the operating theatre for fluid and drug management. The monitor enables anesthetists to get accurate and immediate feedback on the patient's fluid and hemodynamic status - a key measure of overall well-being before, during and after surgery. The LiDCOrapid provides:

·;

early and rapid warning of hemodynamic change to aid choice of therapeutic route: fluid or drug

·;

quantification of hemodynamic response,

·;

guidance on effective delivery of fluids to ensure the right amount at the right time

LiDCOview: an easy-to-use graphical display of historical LiDCOplus and LiDCOrapid hemodynamic data.